
var t = null;
t = setTimeout(time,1000);
function time() {
    clearTimeout(t);
    dt = new Date();
    var y =dt.getFullYear();
    var mt = dt.getMonth()+1;
    var day = dt.getDate();
    var h = dt.getHours();
    var m = dt.getMinutes();
    var s = dt.getSeconds();
    document.querySelector(".showTime").innerHTML = '当前时间:'+ y + '年' + mt + '月' + day + 
    '-' + h + '时' + m + '分' + s + '秒';
    t =setTimeout(time, 1000);
} 